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Dr Jonathan Katz

MBBChir MD FRCP

Diabetes & Endocrinology Specialist

Live bookings available

35 years of experience

Bushey, WD23 1RD

(+3 more)

52 connections in healthcare

Skill endorsed

by Dr Akeel Alisa, Dr Melanie Romain and 5 other professionals

5

/5

(51 reviews)

Live bookings available

35 years of experience

Bushey, WD23 1RD

(+3 more)

52 connections in healthcare

Skill endorsed

by Dr Akeel Alisa, Dr Melanie Romain and 5 other professionals

Areas of expertise

All
Reviews
Skill Endorsements
Thyroid Problems
24
4
Blood Glucose Monitoring
8
1
Hormone Disorders (Male)
5

Contact

Book online


Expert in:

About Dr Jonathan Katz

Dr Jonathan Katz is a Consultant in Diabetes & Endocrinology, based at Barnet Hospital, which is part of the The Royal Free London NHS Trust. He has over 30 years experience in treating patients with Thyroid problems, Pituitary disorders, Diabetes and other hormone imbalances including Calcium disorders, Menopause, Testosterone Deficiency and Addison's Disease.

Dr Katz studied medicine at Cambridge University and University College London, qualifying in 1991. He specialised in Endocrinology, completing registrar training at UCLH, the Whittington Hospital and the Royal Free Hospital. During higher training he undertook a two year research fellowship for his MD thesis on polycystic ovary syndrome. Following that,  he worked for 1 year as a registrar in Sydney, Australia before returning to teh Royal Free Hospital for his final resgistrar year. Dr Katz was appointed as a Consultant in Diabetes and Endocrinology in 2002.

Dr Katz works as a Consultant Endocrinologist for the Royal Free London NHS Foundation Trust, based at Barnet Hospital. In 2009, he was elected as a Fellow of the Royal College of Physicians (FRCP), an honour granted to consultants providing the highest standards of care. In 2019, Dr Katz was appointed as Regional Advisor for the Royal College of Physicians – this is an elected post with wider responsibilities : supporting training, ensuring new consultant posts fulfil Royal College standards, chairing regional conference updates for physicians and appointing College Tutors.

Dr Katz has a busy NHS Endocrinology practice, seeing over 300 new patients and over 1000 follow-up patients each year. In addition, he looks after inpatients at Barnet Hospital with diabetes emergencies and acute endocrine disorders.


Subspecialties

  • Diabetes
  • Endocrinology

Areas of expertise

All
Reviews
(67)
Skill Endorsements
(21)

Click the bar to read reviews or skill endorsements

Thyroid Problems
24
4
Blood Glucose Monitoring
8
1
Hormone Disorders (Male)
5
Men's Health
4
Hashimoto's Thyroiditis
4
Hypothyroidism
3
1
Pituitary Disorders
3
Testosterone Replacement Therapy (TRT)
3
Prolactin Disorders
3
Type 2 Diabetes
1
3
Diabetes Insipidus
1
Prolactinoma
1
Reproductive Disorders
1
Goitre
1
Stress
1
Women's Health
1
Tiredness (Fatigue)
1
Telogen Hair Loss
1
Cortisol Disorders
1
Acromegaly (Gigantism)
3
Polycystic Ovary Syndrome (PCOS)
2
Endocrine Disorders
2
Obesity
1
Hyperthyroidism
1
Type 1 Diabetes
1
Thyroid (Blood Test)
1
Prediabetes
1
Cushing's Syndrome
Pituitary Tumour
Hypogonadism
Pheochromocytoma
Vitamin D Deficiency
Thyroid Nodules
Addison's Disease
Hormone Imbalances and Disorders (Female)
Graves' Disease
Adrenal Disease
Hyperlipidaemia
Metabolic Syndrome
Testosterone Deficiency
Parathyroid Disease
Pituitary Function Test
Synacthen Test
Dexamethasone Suppression Test
Menopause

Registered with

General Medical Council

No. 3490022


Education

University of Cambridge

Medicine

Graduated 1991


Qualifications

  • MB BChir - Cambridge University 1991
  • MD - University of London 2001
  • FRCP - Royal College of Physicians 2009

Languages spoken

  • English

Insurers

  • General and Medical
  • Freedom Health Insurance
  • The Exeter
  • Simply Health (Dental)
  • Healix Health Services
  • Cigna
  • Bupa
  • WPA
  • Allianz Worldwide Care
  • AXA Health
  • Aviva Health
  • Vitality
  • The PHC
  • Benenden Health

Fees

  • New appointment

    £295
  • Follow-up appointment

    £195
*May vary on location

Locations

Spire Bushey Hospital

Heathbourne Road, Bushey, United Kingdom, WD23 1RD

4.88(1,050 reviews)

Opening hours

Monday - Friday
Saturday
Sunday

Facilities

Wheelchair Accessible
Free Parking
View practice profile

Opening hours

Monday - Friday
Saturday
Sunday

Facilities

Wheelchair Accessible
Free Parking
View practice profile

The Kings Oak Hospital (part of Circle Health Group)

Chase Farm, Enfield, United Kingdom, EN28SD

4.81(811 reviews)

Opening hours

Monday - Friday
Saturday
Sunday

Facilities

Wheelchair Accessible
Free Parking
View practice profile

The Cavell Hospital (part of Circle Health Group)

Cavell Drive, Uplands Park Rd, Enfield, London, United Kingdom, EN2 7PR

4.79(493 reviews)

Opening hours

Monday
Tuesday
Wednesday
16:00 - 18:00
Thursday
Friday
Saturday
Sunday

Facilities

Wheelchair Accessible
Free Parking
View practice profile

Spire Bushey Diagnostic Centre

290 Centennial Ave, Elstree Borehamwood, London, United Kingdom, WD6 3SU

4.88(384 reviews)

Opening hours

Monday
Tuesday
Wednesday
Thursday
15:00 - 17:00
Friday
Saturday
Sunday

Areas of expertise

All
Reviews
Skill Endorsements
Thyroid Problems
24
4
Blood Glucose Monitoring
8
1
Hormone Disorders (Male)
5

Contact

Book online

Reviews

AI Review Summary

This summary was created by AI based on recent reviews

Dr Jonathan Katz is a knowledgeable and professional specialist who ensures patients feel listened to and fully understand their treatment. He provides clear explanations, taking time to address individual needs and concerns without rushing consultations. Patients commend his methodical approach to diagnosis, comprehensive follow-up care, and effective coordination with other medical teams. Patient feedback highlights his significant expertise in managing thyroid conditions and regulating blood glucose.

5
verified patient
14 Sep 2026

I felt I was listened to and that there is a solution to the problem I have had.

Patient seen for:
5
verified patient
05 Sep 2026

I went to see Dr Katz for a private consultation after I was referred through my NHS GP, but was still waiting for an NHS consultation after 6 months with no appointment. He was very polite, patient and listened to my history without interrupting. He took his time with his investigation and we sat and discussed options. He gave a diagnosis and treatment advice. He was aware that I was self funding and gave suggestions regarding the most economical way of moving forward. Overall a very positive experience and I would definitely recommend.

5
verified patient
30 Aug 2026

Consultant was very patient and informative. Maintains a person centred approach to his practice which is very positive. I am happy with the service provided and wish to continue receiving such support.

5
verified patient
29 Aug 2026

Dr Katz came highly recommended, and rightly so. I have been extremely impressed and delighted with every aspect of his care. I am so pleased with the outcome of visiting Dr Katz and would highly recommend him.

Patient seen for:
5
verified patient
29 Aug 2026

Excellent doctor the best!

Patient seen for:
5
verified patient
23 Aug 2026

Dr Katz was very thorough and easy to talk to. He commented very quickly with results and reports and gave us time to ask questions . Can recommend

5
verified patient
23 Aug 2026

I am 64years old mam with not previous history of illness and have tried to look after my self. However, following an insect bite on face, it seems to have triggered my Thyroid from over acting. My GP recommended Dr Katz and following a short wait, it was worth seeing him. He was professional and asked good questions. He summarised well and answered all my questions. - Appointment was on time. At the end of the session, I was clear about the next steps and felt I was in "good hands".

Patient seen for:
5
verified patient
15 Aug 2026

I have been under the care of Dr Katz following my thyroidectomy in December 2025, and I couldn’t recommend him highly enough. He is extremely knowledgeable and thorough, he listens to my concerns and takes my individual needs into consideration. He has been instrumental in helping to keep my thyroid levels well monitored and appropriately managed following my surgery. He also communicates and liaises very well with my other doctors, which has made the whole process feel a lot more reassuring. He is always pleasant, approachable and easy to deal with. I am very grateful for the support and expertise he has provided throughout my treatment.

Patient seen for:
5
verified patient
21 Jul 2026

Dr Katz is very patient and communicates well with my oncology team which is essential. He is great at listening to any concerns I have and looking at things as a whole and working out what is best for me.

5
verified patient
21 Jul 2026

Dr Katz is extremely helpful and personable. He has treated me more as an old friend than just a patient. He is an absolute pleasure to consult

Patient seen for:
Your trust is our top concern, so providers can't pay to alter or remove reviews.
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Skill Endorsements

A remarkable colleague with excellent skills and knowledge. Much admired and appreciated by patients and families

20 Aug 2026
Endorsed for
Thyroid Problems
Acromegaly (Gigantism)
Diabetes

Dr Akeel Alisa

Dr Akeel Alisa

Gastroenterologist
Is a colleague

Dr Katz is an excellent and knowledgeable endocrinologist who I have known for many years. I would not hesitate to recommend him

03 Jun 2026
Endorsed for
Thyroid Problems
Acromegaly (Gigantism)
Diabetes

Dr Melanie Romain

Dr Melanie Romain

Geriatric Doctor
Is a colleague

I have known Dr Katz for many years and can say with confidence that he is a skilled, trustworthy endocrinologist

19 May 2026
Endorsed for
Thyroid Problems
Blood Glucose Monitoring

DK

Dr Felicity Kaplan

Diabetes & Endocrinology Specialist
Is a colleague

Dr Katz consistently provides a top tier opinion on all aspects of endocrinology and diabetes. He has excellent clinical skills and patients I have referred him always receive great care. I have no hesitation in recommending him.

09 Apr 2026
Endorsed for
Thyroid Problems
Type 2 Diabetes
Prediabetes

Dr Kwok Tang

Dr Kwok Tang

Gastroenterologist
Is a colleague
Dr Jonathan Katz logo

Get to know Dr Jonathan Katz

FAQ

What are Dr Jonathan Katz's reviews like?

Dr Jonathan Katz's overall patient rating is 5 out of 5 stars on Doctify. This is based on 51 reviews.

What languages does Dr Jonathan Katz speak?

Dr Jonathan Katz speaks English

Where is Dr Jonathan Katz located?

Dr Jonathan Katz primarily practices at Spire Bushey Hospital, located at Heathbourne Road, Bushey, United Kingdom, WD23 1RD
See more locations

What are Dr Jonathan Katz working hours?

Dr Jonathan Katz is working Wednesday (16:00 - 18:00), Thursday (15:00 - 17:00)

Find where Dr Jonathan Katz operates today

Does Dr Jonathan Katz accept new patients?

Dr Jonathan Katz generally accepts new patients.

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